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On heterochain polyamides—XVII. Polyamides from p-xdylylenediamine
ABSTRACTS FROM PAPERS PUBLISHED IN VYSOKOMOLEKULIARNYE SOEDINENIIA Vol. 1, No. 4, 1 9 5 9 * ON HETEROCHAIN POLYAMIDES--XVI. POLYAMIDES CONTAINING THE SILOXANE GROUP IN THE PRINCIPAL CHAIN
T. M. F r u n z e , V. V. K o r s h a k , D. N. A n d r e e v , E. V. K u k h a r s k a i a , V y s o k o m o l . soedin. 1: No. 4, 489-494, 1959. A NUMBEI~ of homogeneous and mixed polyamides containing siloxane groups in the principal chain have been prepared. Incorporation of the siloxane group causes a sharp fall in the flow temperature. Polyamides containing aliphatic units only are transparent and are distinguished by a high elasticity. In the course of time crystallization gradually sets in, accompanied by growing turbidity and decreasing elasticity of the specimens. This is due both to the high flexibility of the siloxane chains, as well as to the presence of side chain substitutents at the silicon atom, hindering chain ordering. ON HETEROCHAIN POLYAMIDES--XVII. POLYAMIDES FROM p-XYLYLENEDIAMINE
T. M. F r u n z e , V. V. K o r s h a k , E. A. K r a s n i a n s k a i a , V y s o k o m o ] . soedin. 1: No. 4, 495-499, 1959. POLYAMIDES have been synthesized from p-xylylenediamine and various aliphatic and aromatic acids. In general tile reaction products are opaque substances, often coloured to a certain extent and with quite high melting temperatures. The polyamide prepared from the salt of /8ophthalic acid is amorphous. With increasing number of methylene groups in the dicarboxylic acid molecule, the flow temperature of the polymers containing acid residues with an even number of methylene groups is always higher than in the case of polymers obtained from acids with an odd number of the groups. Mixed polyamides obtained from the salts of sebacic acid with p-xylylenediamine and hexamethylenediamine exhibit a linear relation between the flow temperature and the composition, being an example of the system of isomorphous polyamides. ON HETEROCHAIN POLYAMIDES--XVIII. FORMATION OF MIXED POLYAMIDES DURING MELTING OF THE HOMOCHAIN COMPOUNDS
T. M. F r u n z e , V. V. K o r s h a k , V. A. M a k a r k i n , V y s o k o m o l . soedin. 1: No. 4, 500-505, 1959. THE interaction between homoehain polyamides on their being heated at temperatures above melting has been investigated. Determinations were made of the change in the flow temperature, in the ratio of soluble and insoluble fractions, in the crystallinity and in the solubility of the products with increasing time of heat treatment. In the course of the heating process, block copolymers are evidently formed first, changing on subsequent heating to ordinary mixed copolymers, viz., mixed polyamides. The block copolymers have a short life~3-5 hr. * English abstracts reprinted from Vysokomol. soedin. 1: No. 4, 1959. 318
T. M. F r u n z e , V. V. K o r s h a k , D. N. A n d r e e v , E. V. K u k h a r s k a i a , V y s o k o m o l . soedin. 1: No. 4, 489-494, 1959. A NUMBEI~ of homogeneous and mixed polyamides containing siloxane groups in the principal chain have been prepared. Incorporation of the siloxane group causes a sharp fall in the flow temperature. Polyamides containing aliphatic units only are transparent and are distinguished by a high elasticity. In the course of time crystallization gradually sets in, accompanied by growing turbidity and decreasing elasticity of the specimens. This is due both to the high flexibility of the siloxane chains, as well as to the presence of side chain substitutents at the silicon atom, hindering chain ordering. ON HETEROCHAIN POLYAMIDES--XVII. POLYAMIDES FROM p-XYLYLENEDIAMINE
T. M. F r u n z e , V. V. K o r s h a k , E. A. K r a s n i a n s k a i a , V y s o k o m o ] . soedin. 1: No. 4, 495-499, 1959. POLYAMIDES have been synthesized from p-xylylenediamine and various aliphatic and aromatic acids. In general tile reaction products are opaque substances, often coloured to a certain extent and with quite high melting temperatures. The polyamide prepared from the salt of /8ophthalic acid is amorphous. With increasing number of methylene groups in the dicarboxylic acid molecule, the flow temperature of the polymers containing acid residues with an even number of methylene groups is always higher than in the case of polymers obtained from acids with an odd number of the groups. Mixed polyamides obtained from the salts of sebacic acid with p-xylylenediamine and hexamethylenediamine exhibit a linear relation between the flow temperature and the composition, being an example of the system of isomorphous polyamides. ON HETEROCHAIN POLYAMIDES--XVIII. FORMATION OF MIXED POLYAMIDES DURING MELTING OF THE HOMOCHAIN COMPOUNDS
T. M. F r u n z e , V. V. K o r s h a k , V. A. M a k a r k i n , V y s o k o m o l . soedin. 1: No. 4, 500-505, 1959. THE interaction between homoehain polyamides on their being heated at temperatures above melting has been investigated. Determinations were made of the change in the flow temperature, in the ratio of soluble and insoluble fractions, in the crystallinity and in the solubility of the products with increasing time of heat treatment. In the course of the heating process, block copolymers are evidently formed first, changing on subsequent heating to ordinary mixed copolymers, viz., mixed polyamides. The block copolymers have a short life~3-5 hr. * English abstracts reprinted from Vysokomol. soedin. 1: No. 4, 1959. 318